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Webster 1913 Edition

Noun.

The quality of being extensible; the capacity of being extended;

as, the

extensibility

of a fiber, or of a plate of metal

Adj.

[from extensible.] The capacity of being extended, or of suffering extension; as the extensibility of a fiber, or of a plate of metal.

extensibility ‎(usually uncountable, plural extensibilities)

The capability of being extended
(computing) A quality of design that takes possible future advances into consideration and attempts to accommodate them

capability of being extended